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If we had a pair of copies inside a loop which introduced new liveness to a subregister which was undef before the loop, we would have a dummy phi-only segment remaining across the loop body. Later, this false segment would confuse RenameIndependentSubregs causing it to introduce IMPLICIT_DEFs with broken value numbering. It seems always adding the lanes to ShrinkMask is OK, so any conditions should be purely a compile time filter.
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